Formerly About Advanced Micro Devices Message Board

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Politics : Formerly About Advanced Micro Devices

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To: Cirruslvr who wrote (59805)	5/27/1999 2:28:00 PM
From: Shane Geary	Read Replies (1) of 1573849

Cirrusvlr - Re "how many K7's can fit on a wafer" By my (well, by a Nikon stepper's) calculations, about 140-150 die per wafer. The reason that you don't get the theoretical maximum (ie wafer area divided by die size (or 171 for K7)) is that (i) you lose about 1.5mm around the wafer edge where die won't yield, and (ii) you're fitting square chips on a circular wafer. Regards, Shane

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